Electric heater for electric glower-lamps.



J. VAN VLECK 6. W. N. STEVENS.

Patented lune 4, I90l.

ELECTRIC HEATER FOR ELEGTRIG GLOWER LAIPS.

(Application flltd Apr. 27, 1900.)

(No Kodak.)

WITNESSES m 40ml,

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M/VENTOR k A TTOHNEY UrvTTEn STATES PATENT OFFICE.

JOHN VAN VLECK AND YVILLIAM N. STEVENS, OF NEW YORK, N. Y.

ELEGTFHC HEATER FOR ELECTRIC G'LOWER-LAMPS.

SEEGIFIGATION forming part of Letters Patent No. 675,427, dated June1901.

Application filed April 2'7, 1900.

To all whom it may concern:

Be it known that we, JOHN VAN VLECK and NILLIMI N. STEVENS,0f the cityof New York, State of New York, have invented a new and usefulImprovement in Electric Heaters for Electric Glower-Lamps, of which thefollowing is a specification.

Our invention relates to that type of electrio lamp in which there is aglower normally non-conducting, but which becomes conducting and causedto glow upon being raised to a certain temperature, and moreparticularly that class of such lamps in which the glower is elevated intemperature by radiation from an electric heater in suitable proximitythereto.

Our invention consists, broadly, in a removable electric heating devicefor electric glower-lamps, in such a device so constructed and arrangedas that when it is adjusted to the lamp it will be guided into properoperative position with respect to the glower and circuit automaticallyestablished through the heating coil or wire, in the construction of theremovable heater-supporting plug or support, in the construction of thelamp containing both a removable glower and a removable electric heater,and in the various combinations hereinafter more particularly pointedout.

In the accompanying drawings, Figure 1 is a vertical section on the line1* 1* of Fig. 2, and Fig. 2 is a transverse section of our device on theline 1* 1* of Fig. 1.

Similar letters and numerals of reference indicate like parts. i

The lamp-support consists, first, of a body of plaster or othernon-conducting material A, which is inclosed in a metallic case B. Inthe body of plasterA there is a central opening 0 for the passage of theconducting-wires and for the attachment of the device in place. On thelower edge of the shell or case B there is a circular flange D, in whichis received an annular body of non-conducting material E. This body ofnon-conducting material has an outer case or shell F, of metal, and aninner shell G, also of metal. The outer metal case F bears against andmakes electrical contact with the flange D. The lower edge of theannular body E is tapered downward and is provided with a metal liningH, which is bent over and screw threaded, as shown at 1.

Serial No. 14,521. (No model.)

Above this lining there is a body of plaster or other non-conductingmaterial J, in which is embedded a contact-plate K, which communicateswith one of the circuit-wires a. A branch I) of circuit-wire a isconnected to the shell F. The other circuit-wire c is connected to theinner shell G. Outside of and secured upon the shell E is a flangedsocket L, which is adapted to receive and hold in any suitable way theprotecting glass cylinder M.

N is the glower-supporting plug, the outer shell of which incloses abody of plaster or other non-conducting material.

0 is the glower, supported by said plug and having one end connectedwith the wire (Z, dotted lines, which communicates with thecontact-plate c on the upper surface of said plug. The other end of theglower communicates with the shell N.

The detachable electric heating device is a cylindrical body of plasteror other non-conducting material 1, inclosed in a metallic shell 2 andsupported upon a metal flanged ring 3, the said ring 3 being secured tothe flat bottom portion of the shell 2. \Vithin the cylindrical body 1there is a cylindrical opening havin a screw-threaded sheet-metal liningl.

5 is the heater-supporting plug, which consists of a metal shell 6screw-threaded at its upper port-ion, so as to be received in thethreaded lining 4, and having in its lower portion a body of plaster orother non-conducting material 7. Upon the upper surface of this body ofplaster 7 and within the plug 5 is supported the heater 8, which may bea coil or other shaped body of thin platinum wire, for example. One endof this heater 8 is connected to a contact-piece 9, secured on the underside of the body of plaster 7. The other end of the heater 8 isconnected to the shell 6.

WVithin the cylindrical body of plaster 1 is a contact-plate 10, whichwhen the heatersnpporting plug 5 is in place makes electrical contactwith the plate 9.

Secured to the lining 4 of the cylindrical body 1 is a contact-spring11, and also embedded in said body 1 and in electrical contact with theshell 2 is another contact-spring 12.

Ordinarily the electric heating device just described is removed fromthe lamp and is inserted when it is desired to set the lamp inoperation, suitably elevating the temperature of the glower 0. Then theheating device is inserted, as shown in Fig. 1, the ring 3 meets thelower edge of the -protecting glass cylinder M, thus insuring theadjustment of the electric heating device in proper position, or, inother words, so that the heater 8 will be in proper heating proximity tothe glower O, which glower, as shown, extends down into the opening inthe upper side of the heater-plug 6. The circuit which feeds the glowerproceeds by thewire a to the contactplate K and contact-plate e, and soby the wire 01 to the glower, and thence by the shell N to the shell G,and so to the wire I). When the heating device is in place, as shown inFig. 1, the circuit for feeding the heater proceeds by the wire athrough the branch wire I) to the shell F, to the spring 12, shell 2,and thence by the embedded wire to the contactspring 10, contact-plate9, wire g, heater 8, the shell 6, to the lining 4, to the contactspring11,-and so to lining H, shell G to wire 0. The upper ends of the springs11 and 12 are inclined upwardly, so that when the heating device is putin position, as shown in Fig. 1, they receive between them the taperedlowered portion of the annular piece E and make electrical contactrespectively with the lining H and the outershell F. The electricalheating device is kept in the position shown in Fig. 1 until the glowerO is sufficiently heated by radiation from the heater 8, when thecurrent then becomes established through the glower, after which theheating device is removed. The heating device may j vof'course beattached to any suitable handle.

We desire to call particular attention to the following points: Theheater proper, 8, is supported upon and within its plug 5, so as tobereadily removable therewith. The shell of the plug incloses the heaterand so forms a hood around the same operating to confine the radiations.When the plug is in place, as shown in Fig. 1, the glower O enters thishood, and thus is subjected 'to the heat confined within the hood.Circuit is closed through the heater automatically when its support isplaced within the cylinder M. As the position of this support within thecylinder is determined by the ring 3, it is apparent that the heatercannot be otherwise than properly placed with respect to the glower. Itwill also be observed that both the glower-plug and the heater-plug aredetachable, and yet that the construction is such that it is practicallyimpossible to put them back in their supports except correctly.

We have described the cylinder M as held in the flanged socket L of theglower-support; but it will be obvious that it may be free from thatsocket and held in the ring 3, thus being united with the heatersupportinstead of the glower-support. In such case of course when the electricheating device is removed from the lamp the cylinder will be removedwith it.

We do not limit ourselves to the use of the contact-springs 11 and 12for establishing cir cuit between the heater support and theglower-support, inasmuch as we-may employ any other suitablecontact-closing device arranged to operate in like manner when theheater-support'is put in the position shown in Fig. 1.

We claim- 1. In an electric glower-lamp, a glower, an electric heatertherefor, a holder for said heater and a support for said heater-holder,contact-terminals respectively on said holder and said support; the saidholder and said support being constructed and arranged so that circuitshall be established by contact of said terminals when said holder isapplied to said support and broken when said holder is removed from saidsupport and also so that said heater may be placed in operative posi*tion with respect to said glower'or removed from said position withoutinterference with said glower, substantially as described.

2. In an electric glower-lamp, a glower, a cylindrical guard surroundingthe same, a heater and a support therefor adapted to fit within and beremovable from said guard, and means for determining the proximity ofthe heater to the glower, substantially as described.

In an electric glower-lamp, a glower, a threaded plug supporting saidglower, a threaded tube adapted to receive said plug, and a sockethaving its body portion of insulated material and containing a circularrecess wherein said threaded tube is supported; the said recess being ofgreater diameter than said tube, substantially as described.

4:. I11 an' electric lamp, a socket, a glower, a plug supporting saidglower and detachably connected to said socket, contact-plates I, K onsaid socket and circuit connections to said glower and contact-plates,substantially as described.

5. In an electric glower-lamp, a socket, a glower, a plug supportingsaid glower and detachably connected to said socket, contactplates onsaid socket and circuit connections between said glower andcontact-plates, a re-' movable heater and means for electricallyconnecting said heater to said contact-plates, substantially asdescribed.

6. In an electric heater for electric glowerv lamps, a metal shell, ablock of insulating material, and a rod or coil of conducting ma terialwithin said shell and supported on said block, substantially asdescribed.

7. In an electric heater, for electric glowerlamps, a cylindrical metalshell, a body of non-conductin g material within said shell and solidlyfilling a portion of the same, and a rod or coil of conducting materialsupported on thesaidbodyof non-conducting material, and circuitconnections whereby circuit is estab- 10 disposed Within the unfilledportion of said lished between said socket and heatersupshell,substantially as described. port when said socket is placed in saidrecess,

8. In an electric glower-lamp, a glower, a substantially as described.

support for said gloWer independent of the JOHN VAN VLEOK.

beater-support, a heater and support there- WILLIAM N. STEVENS.

for, circuit connections in said heater-sup- Witnesses:

port, a removable socket having a recess H. R. MULLER,

adapted to receive said heater-support and M. 11. SIEGMAN.

